PA already has solution to you're problem
1. Outlaw mode which gives you +5 % more exp and +5% drop rate
2. Nightmare zone where you can kill anyone you want.
Outlaw and Nightmare zone doesn't fix the issue of macro afk players who just constant grinds on top of you. There is no point of wasting guild funds to dec on 1 player who is macro-ing on top of you.
A higher cp player who macro can just out farm you, and you'll probably have to switch instance. Then there are also when multiple low cp players constant farm on top of you, 1 is okay but when its two macro low level grinding on top of you it gets irrating and you'll probably have to switch for efficient grind. Plus it is a pain to find a new spot.
That is an issue which need to be resolve.